The minimum thickness on the potted PWB is shown below for better definition of the term "covered by materials."
(1) Connection areas on the soldering side of the PWB are to be covered by potting materials having following thickness.
(a) 3.7 mm or more from the PWB surface around lead wire
(b) 2 mm or more from the soldered fillet curve
(c) 2 mm or more from the outer soldered point on the copper foil land
(2) Parts mounting side of the PWB are to be covered by potting materials having a total thickness of
2mm or more including the PWB.